HP M750 A3 print patchy on black only.

Oct 6, 2022
Problem came on suddenly. i.e. Was working perfectly when turned off. Restarted a few hours later, the black is not printing along the centre of the page. Colours are fine. Have tried another cartridge/drum unit. Same. Have taken out the transfer belt & inspected. Cleaned everything I can see but no difference. Thinking I might have to pension the old girl off. It's our standby. Any ideas?

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